Paper-roll-driving mechanism.



R. HOE.

PAPER ROLL DRIVING MECHANISM.

APPLICATION FILED MAYH, 1910.

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Patented N 0v. 26, 1918.'

Ilium-Zion UNITED sTA'rns PATENT OFFICE.

ROBERT HOE 'OF NEW YORK, N. Y.

PAPER-ROLL-DRIVING MECHANISM.

Specification of Letters Patent.

Patented Nov. 26, 191 3.

Application filed May 11, 1910. Serial no. team.

sented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to improvements 1n paper roll driving mechanism for printing and similar machines.

Considerable difficulty has been experienced in properly delivering the paper from the paper rolls employed in connection with modern fast running printing machines. In the constructions ordinarily employed, the roll is rotated to feed the paper by the pull of the web from the roll. Large rolls. however, have considerable momentum, and, consequently, tension and brake devices are employed to control the speed at which the roll rotates to prevent the formation of slack whenthe speed of the machine is decreased or the machine stopped altogether. Many of these tension and brake devices are more or less complicated in construction and they do not operate satisfactorily under all circumstances.

The object of this invention is to provide an improved driving mechanism for the paper rolls of rinting or other similar machines in WlllCh there is employed a continuously running driver engaging the surface of the roll, the roll bein suitably supported independent of the river and the roll and driver being maintained in driving engagement as the roll decreases in size, the driver being driven at suitable speed to properly deliver the web to the machine.

With this and other objects in view, the invention consists in certain constructions and in certain parts, improvements and combinations as will be hereinafter fully described and then specifically pointed out.

Referring to the drawings,

Figure 1 illustrates an improved roll driving mechanism in plan view.

Fig. 2 is a side elevation of the construction illustrated in Fig. 1.

In the drawings, which illustrate one embodiment of the invention, lindicates the side frames of the machine. Suitably mounted in the frame is a driver comprising a roll 2 mounted on a shaft 3, provided with a driving gear 4 which may be suitably geared with any moving part of the machine, so that the driver may be driven at the proper speed, i. c., may have a surface speed which corresponds with the surface speed of the printing cylinders. The driver may be provided with any suitable frictional surface, such, for instance, as rubber or canvas.

In the particular construction illustrated, provlsion is made for advancing a plurality of rolls into contact with and for driving such rolls from one driver, two rolls being shown, the shafts of these rolls being marked 5. The driver is located so as to engage the exterior surface of the paper roll or rolls, and, in the particular machine shown the advancing mechanism forces the roll or rolls into contact withand maintains the engagement between the driver and the roll 01 rolls as the rolls decrease in size. The particular means by which the advance of the roll or rolls and the engagement with the driver is maintained may be varied within wide limits. In the particular construction illustrated, there is rovided a source of fluid under ressure. en fluid under pressure is emp oyed to advance the roll or rolls and to maintain the driving relation with re-' spect to the driver, the character of the source from which this fluid is maintained may be varied widely. In the particular construction illustrated, there is provided an accumulator or reservoir 6 in which fluid under pressure is maintained, the fluid entering said reservoir by means of a pipe 7, a suitable regulating valve, as 8, being employed, if desired, to control the inflow of the fluid. As shown, this reservoir is provided with an outlet pipe 9 which, by means of two branches 10, conveys the fluid under pressure to iston chambers 11 mounted on the frame of the machine. In the particular construction shown, inasmuch as two rolls are illustrated, two pairs of these piston chambers containing pistons 12 are employed, but as the construction of these chambers and their connections is identical, only one pair is described. The advancing and engagement maintainin means operate in connection with roll suppIying means the character of which may be varied. In the machine shown, the pistons 12 are connected by rods 13 with the bearings 14 in which the paper roll is mounted. These bearings are shown as supported and as movable on ways 15 formed on the machine frame. The pipes 10 are further provided with branches 16, 17, so that the fluid may be admitted to the piston chambers on either side of the piston, the flow being controlled by suitable cocks 18. When, as in the construction shown, two pairs of piston chambers are employed, what may be termed the second pair of chambers may be supplied with the fluid pressure by branch pipes 19, cocks as 20 controlling these pipes. By this construction, either or both of the two rolls shown may be brought into driving relation with and maintained in such relation or may be moved and maintained out of driving relation.

The operation of the construction will be readily understood from the foregoing description. The webs may be led over the usual tension rolls 21, 22, and inasmuch as the speed of the driver will be constant and will correspond with the surface speed of the cylinders, and inasmuch as the driving relation will be maintained notwithstanding the decrease iii size of the web roll, the webs will be positively fed at the speed of the driver to the machine.

Changes and variations may be made in the construction by which the invention is carried into effect. The invention is not, therefore, to be confined to the particular construction hereinbefore described and illustrated in the accompanying drawings.

What is claimed is 1. In a driving mechanism for paper rolls, the combination with means for supporting a roll, of a continuously running driver engaging the surface of the roll, a source of elastic fluid pressure, and connections for applying said fluid pressure to maintain the driving engagement between the driver and the roll as the roll varies in size.

2. In a driving mechanism for paper rolls,

the combination with a continuously running driving roll, of a ipaper roll shaft, bearings in which the she is supported, ways on which the bearings slide, a source of fluid pressure, and connections between said source and the bearings whereby the roll shaft is moved as the roll decreases in size so as to maintain driving engagement between the driver and the surface of the roll.

3. In a driving mechanism for paper rolls, the combination with a continuously running driving roll, of a paper roll shaft. sliding bearings therefor, ways in which the bearings move, a source of fluid pressure, and suitable connections between the source of fluid pressure and the bearings for maintaining the roll in constant engagement with the driver as the roll decreases in size an for moving the bearings away from the drivin g roll to interrupt the driving engagement.

4:. In a driving mechanism for paper rolls, the combination with a continuously running driver, of a paper roll shaft, sliding bearings therefor, ways in which the bearings move, a source of fluid pressure, piston chambers, pistons in the chambers, piston rods connecting the pistons and the bearings, pipe connections and controlling valves for admitting the fluid to either side of the pistons whereby the paper roll may be kept in constant engagement with the driver as the roll decreases in size and may be moved away from the driver when desired to interrupt the driving engagement.

In testimony whereof, I have hereunto set my hand, in the presence of two subscribing witnesses,

ROBERT HOE.

Witnesses F. W. H. CRANE, Gno. N. WILLIAMSON.

INS 

